*{
  margin: 0;
  padding: 0;
  font-family: consolas;
  box-sizing: border-box;
}
body{
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: #001925;
}

.list{
  padding: 30px 75px 10px 30px;
  position: relative;
  background: #042b3e;
  border-top: 50px solid #03a9f4
}

.list h2{
  color: #fff;
  font-size: 30px;
  padding: 10px 0;
  margin-left: 10px;
  display: inline-block;
  border-bottom: 4px solid #fff
}

.list label{
  position: relative;
  display: block;
  margin: 40px 0;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

.list input[type="checkbox"] {
  -webkit-appearance: none;
}

.list i{
  position: absolute;
  top:2px;
  display: inline-block;
  width: 25px;
  height: 25px;
  border: 2px solid #fff;
}

.list input[type="checkbox"]:checked ~ i{
  top:1px;
  border-top:none;
  border-right: none;
  height: 15px;
  width: 25px;
  transform: rotate(-45deg);
}

.list span{
  position: relative;
  left: 40px;
  transition: 0.5s;
}

.list span::before{
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: #fff;

  transform:translateY(-50%) scale(0);
  transform-origin: right;
  transition: transform 0.8s;
}

.list input[type="checkbox"]:checked ~ span::before{
  transform:translateY(-50%) scale(1);
  transform-origin: left;
  transition: transform 0.8s;
}

.list input[type="checkbox"]:checked ~ span{
  color: #154e6b;
}